I'm running the latest High Sierra public beta on my 2015 rMBP, and I've had no trouble until now. I converted my macOS partitions to APFS during the first public beta and have upgraded since then with no issues. Earlier today, I decided to restart my rMBP, but instead of booting back into macOS, it booted into my Windows partition. I've restarted before, whilst in the public beta, with no issues. I booted to internet recovery and opened Disk Utility. It showed the following: I fired up Terminal and ran diskutil list, which returned the following for /dev/disk0: Code: 0: GUID_partition_scheme - 500.3 GB - disk0 1: EFI - EFI - 209.7 MB - disk0s1 2: 7C3457EF-0000-11AA-AA11-00306543ECAC - 424.3 GB - disk0s2 3: 5361644D-6163-11AA-AA11-00306543ECAC - 655.4 MB - disk0s3 4: Microsoft Basic Data - BOOTCAMP - 75.1 GB - disk0s4 I tried running the following on the off chance it would fix it Code: asr adjust --target /dev/disk0s2 --settype "Apple_APFS" but it just returned: Code: asr: volume adjustment failed: unknown error: -123 I guess that's due to the rMBP's release year, but it didn't work nonetheless. Any thoughts on how I might fix this? The Windows partition works perfectly fine, so it doesn't seem to be a drive failure. I'm trying to put off just reformating the partitions and reinstalling macOS from fresh due to some of my files not being backed up, but I'll do that if I must.